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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file engine_pool.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "engine_pool"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "xmake.h"
#include "engine.h"
#include "engine_pool.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* macros
*/
// the max engine pool count
#define XM_ENGINE_POOL_MAXN (128)
// the singleton type of engine pool
#define XM_ENGINE_POOL (TB_SINGLETON_TYPE_USER + 4)
/* //////////////////////////////////////////////////////////////////////////////////////
* globals
*/
/* the engine pool lock
*
* the pool is a singleton shared by all worker threads, which may alloc/free engines
* concurrently (e.g. parallel batchcmds:lua/vlua jobs run in native threads), so we must
* protect the underlying list against data races, otherwise it will be corrupted and crash.
*/
static tb_spinlock_t g_engine_pool_lock = TB_SPINLOCK_INIT;
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_handle_t xm_engine_pool_instance_init(tb_cpointer_t *ppriv) {
xm_engine_pool_ref_t engine_pool = xm_engine_pool_init();
tb_assert_and_check_return_val(engine_pool, tb_null);
return (tb_handle_t)engine_pool;
}
static tb_void_t xm_engine_pool_instance_exit(tb_handle_t engine_pool, tb_cpointer_t priv) {
if (engine_pool) {
xm_engine_pool_exit((xm_engine_pool_ref_t)engine_pool);
}
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
xm_engine_pool_ref_t xm_engine_pool() {
return (xm_engine_pool_ref_t)tb_singleton_instance(
XM_ENGINE_POOL, xm_engine_pool_instance_init, xm_engine_pool_instance_exit, tb_null, tb_null);
}
xm_engine_pool_ref_t xm_engine_pool_init() {
return tb_single_list_init(0, tb_element_ptr(tb_null, tb_null));
}
tb_void_t xm_engine_pool_exit(xm_engine_pool_ref_t engine_pool) {
if (engine_pool) {
tb_for_all(xm_engine_ref_t, engine, engine_pool) {
if (engine) {
xm_engine_exit(engine);
}
}
tb_single_list_exit(engine_pool);
}
}
xm_engine_ref_t xm_engine_pool_alloc(xm_engine_pool_ref_t engine_pool) {
xm_engine_ref_t engine = tb_null;
tb_spinlock_enter(&g_engine_pool_lock);
if (tb_single_list_size(engine_pool) > 0) {
engine = (xm_engine_ref_t)tb_single_list_head(engine_pool);
tb_single_list_remove_head(engine_pool);
}
tb_spinlock_leave(&g_engine_pool_lock);
return engine;
}
tb_bool_t xm_engine_pool_free(xm_engine_pool_ref_t engine_pool, xm_engine_ref_t engine) {
tb_bool_t ok = tb_false;
tb_spinlock_enter(&g_engine_pool_lock);
if (tb_single_list_size(engine_pool) < XM_ENGINE_POOL_MAXN) {
tb_single_list_insert_tail(engine_pool, engine);
ok = tb_true;
}
tb_spinlock_leave(&g_engine_pool_lock);
return ok;
}
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